measure the length in the image

Hi,

How to measure the length of the continous portion of the object shown in the image?

Answer 1

[Image Analyst]

Try this:

% Tests curl for triggering stats analysis of laundry stain removal raw data.
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
imtool close all;  % Close all imtool figures.
clear;  % Erase all existing variables.
workspace;  % Make sure the workspace panel is showing.
fontSize = 14;
format compact;
%--------------------------------------------------------------------------------------------------------
%    READ IN TEST IMAGE
folder = pwd;
baseFileName = "Image 2.bmp";
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
    % The file doesn't exist -- didn't find it there in that folder.
    % Check the entire search path (other folders) for the file by stripping off the folder.
    fullFileNameOnSearchPath = baseFileName; % No path this time.
    if ~exist(fullFileNameOnSearchPath, 'file')
        % Still didn't find it.  Alert user.
        errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
        uiwait(warndlg(errorMessage));
        return;
    end
end
grayImage = imread(fullFileName);
% Get size
[rows, columns, numberOfColorChannels] = size(grayImage)

rows = 931

columns = 248

numberOfColorChannels = 3

if numberOfColorChannels == 3
    grayImage = grayImage(:,:,1);
end
% Display the image.
subplot(1, 2, 1);
imshow(grayImage);
axis('on', 'image');
impixelinfo;
title('Original Gray Scale Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Threshold the image.
mask = ~imbinarize(grayImage);
% Take the largest blob
mask = bwareafilt(mask, 1);
% Display the image.
subplot(1, 2, 2);
imshow(mask);
axis('on', 'image');
impixelinfo;
title('Original Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Measure bounding box.
props = regionprops(mask, 'BoundingBox');
bb = props.BoundingBox;
hold on;
rectangle('Position', bb, 'EdgeColor', 'r', 'LineWidth', 2)
theHeight = bb(4);
message = sprintf('The height is %d pixels', theHeight)

message = 'The height is 818 pixels'

title(message, 'FontSize', fontSize, 'Interpreter', 'None');

[Turbulence Analysis]

Great!, Thank you very much!!